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Software SBC | Virtualized SBC | Virtual SBC

What is a virtual session border controller or virtualized SBC? Traditionally, a session border controller (SBC) is a device positioned between carrier networks or between an enterprise LAN and a service-provider WAN. In the latter case, the border controller is called an enterprise session border controller or eSBC. Whether it is delivered as a dedicated hardware session border controller or a virtualized network function, (a.k.a. software SBC) the border controller manages call (session) setup and teardown. The SBC also provides network demarcation (demarc), or separation (border) between network domains, as well as other types of management (control) over the data streams that pass between networks. With the growing popularity of software defined networking (SDN) and the burgeoning market development and adoption of network function virtualization (NFV), eSBC functionality is more and more often de-coupled from a dedicated hardware device and delivered as a virtual instance running as a virtual machine (VM) on top of a hypervisor. It is generally not well understood in the market why an eSBC is such a critical network element for a secure and reliable SIP-based enterprise phone system. The following publication will help close that knowledge gap.

Get the Guide: Who needs a Session Border Controller?

Why Virtualize?
Virtualization offers valuable benefits, including touchless, automated service deployment and activation, flexible real-time service scalability (up or down/more or fewer session licenses) through cloud-based edge orchestration, as well as greater reliability and high availability with no hardware limitations.

Virtualized SBC Applications
Whether virtualized and delivered in the cloud, or operated on bare-metal virtual customer premise equipment (vCPE), or implemented as a dedicated hardware device, an enterprise SBC is useful -- actually necessary -- for organizations that choose to implement SIP trunking, Hosted PBX, or unified communications (UC) services such as Microsoft Teams , Microsoft Skype for Business and Office 365 These applications, as delivered in the NFV or VNF model, are described below.

Virtualized SBC for SIP Trunking

software sbc or virtual sbc for SIP trunking, with SBC Access Router

In this scenario, virtualized software eSBC provides all the essential session border controller services as VNF for the organization that uses SIP trunking to provide the business phone system. The virtual SBC (vSBC) protects the corporate LAN form intrusions and other security threats emanating from the wide area network (WAN) with a clear network separation or demarcation point. Protocol translation (SIP normalization) ensures interoperability between the enterprise and the ITSP implementations of the SIP protocol. A common issue with Microsoft UC services is translation between industry-standard UDP protocol data units (PDUs) for SIP/RTP encoding versus Microsoft's divergent TCP implementation.

Virtualized SBC for Hosted PBX

software sbc or virtual sbc for hosted PBX with SBC Access Router></center><br><br>
<b>When implementing a business phone system or hosted telephony system delivered in the cloud</b>, the software session border controller is an essential network element. For this hosted-PBX business telephony scenario, the virtual session border controller provides such critical services as: <br><br>
<ul class=
  • Secure demarcation between service provider WAN and enterprise LAN
  • SIP normalization and interoperability among all SIP systems
  • QoS for crystal clear voice quality
  • Multi-WAN support for business continuity with voice and data survivability
  • Station to station calling preserves intra-office phone service during Internet or WAN outage
  • Edge Orchestration
    Whether the eSBC is virtualized in the cloud or installed on a universal CPE (uCPE) at the subscriber premise, Network Edge Orchestration (a.k.a. intelligent edge) is typically required to activate, configure, scale (up or down), monitor and control VNF-based virtualized eSBC services.


    Show Me: Virtualized Session Border Controller


    Virtualized IPv4 to IPv6 Network Gateway

    Converting ipv6 to ipv4 with VPN Concentrator Software: Convert IPv4 IPv6 using a virtualized ipv6 to ipv4 converter. ipv4 ipv6 converter, ipv6 to ipv4 gateway, IPv6 to IPv4 network gateway

    Virtual SmartNode IPv4 to IPv6 Network Gateway

    The vSN IPv6 Gateway is a member of the SmartNode product family. It is one of several useful applications/use cases the virtual SmartNode can provide as virtual customer premise equipment (vCPE). By providing an IPv6 transition mechanism and IPv6 compatibility, the vSN IPv6 to IPv4 Network Gateway allows enterprises to support the current generation of IPv4 devices and emerging IPv6 devices concurrently, while seamlessly managing the organizations migration to IPv6 at their own desired pace. Virtualization technology allows user capacity and network gateway features to be added or removed as needed in real time or on automated scheduled using the Patton Cloud Edge Orchestration service.

    Teach Me: Virtualized Session Border Controller (Software SBC, Virtual SBC, SBC Access Router

    Virtualized Network Functions employ virtualization technology to deliver networking services traditionally provided by dedicated hardware appliances. Virtualization removes a software function or service from interdependence with a resident hardware device. This de-coupling allows multiple hardware devices and multiple instances of the software to be geographically and logically distributed, thus providing redundancy, enabling greater scalability, and delivering higher availability. Server virtualization is a common application that employs a hypervisor-a layer of software used to emulate the underlying hardware in a conventional server implementation.

    Typical NFV Applications
    Virtual machine technology, that is VNF-based products and services, can be used to address many different challenges when implementing a complex communications network. Several of the most common NFV use cases are described in the examples above.

    Virtual Session Border Controller Terminology
    Short Glossary of Related Acronyms
    eSBC - Enterprise Session Border Controller
    vSBC - Virtual Session Border Controller
    SIP - Session Initiation Protocol
    PBX - Private Branch eXchange
    NFV - Network Function Virtualization
    uCPE - Universal CPE
    vCPE - Virtual CPE
    NFV - Network Function Virtualization
    VNF - Virtualized Network Function
    SDN - Software Defined Networking
    VM - Virtual Machine
    CPE - Customer Premise Equipment
    IaaS - Infrastructure as a Service
    SaaS - Software as a Service

    Common vSBC Synonyms and related terms
    MMBR - Multimedia Border Element
    CUBE - Cisco Unified Border Element
    Border Controller
    Whitebox CPE
    Bare Metal CPE
    Virtual Operating System
    Virtualization Technology
    Virtual System
    VMS software
    Virtual Network
    Cloud Computing
    Server Virtualization

    Edge CPE Software
    SmartNode, VSN
    Virtual CPE: Software SBC, IP Access Router and VPN Server
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